diff --git a/src/more_math/parser.py b/src/more_math/parser.py
index 039db21..b38597c 100644
--- a/src/more_math/parser.py
+++ b/src/more_math/parser.py
@@ -4,6 +4,9 @@ class Parser:
         self.pos = 0
 
     def peek(self):
+        # Skip INDENT/DEDENT/NEWLINE tokens
+        while self.pos < len(self.tokens) and self.tokens[self.pos][0] in {"INDENT", "DEDENT", "NEWLINE"}:
+            self.posF += 1
         return self.tokens[self.pos] if self.pos < len(self.tokens) else ('ENDMARKER', '')
 
     def consume(self):
diff --git a/tests/test_more_math.py b/tests/test_more_math.py
index e439710..0b4fb74 100644
--- a/tests/test_more_math.py
+++ b/tests/test_more_math.py
@@ -3,19 +3,101 @@
 """Tests for `more_math` package."""
 
 import pytest
-from src.more_math.nodes import ConditioningMathNode
+from src.more_math.ConditioningMathNode import ConditioningMathNode
+from src.more_math.LatentMathNode import LatentMathNode
+from src.more_math.ImageMathNode import ImageMathNode
+from src.more_math.parser import Parser
 
-@pytest.fixture
-def example_node():
-    """Fixture to create an Example node instance."""
-    return ConditioningMathNode()
+def test_conditioning_math_node_initialization():
+    node = ConditioningMathNode()
+    assert isinstance(node, ConditioningMathNode)
 
-def test_example_node_initialization(example_node):
-    """Test that the node can be instantiated."""
-    assert isinstance(example_node, ConditioningMathNode)
+def test_conditioning_math_node_metadata():
+    assert ConditioningMathNode.RETURN_TYPES == ("CONDITIONING",)
+    assert ConditioningMathNode.FUNCTION == "condMathNode"
+    assert ConditioningMathNode.CATEGORY == "More math"
 
-def test_return_types():
-    """Test the node's metadata."""
-    assert ConditioningMathNode.RETURN_TYPES == ("IMAGE",)
-    assert ConditioningMathNode.FUNCTION == "test"
-    assert ConditioningMathNode.CATEGORY == "Example"
+def test_latent_math_node_initialization():
+    node = LatentMathNode()
+    assert isinstance(node, LatentMathNode)
+
+def test_latent_math_node_metadata():
+    assert LatentMathNode.RETURN_TYPES == ("LATENT",)
+    assert LatentMathNode.FUNCTION == "latMathNode"
+    assert LatentMathNode.CATEGORY == "More math"
+
+def test_image_math_node_initialization():
+    node = ImageMathNode()
+    assert isinstance(node, ImageMathNode)
+
+def test_image_math_node_metadata():
+    assert ImageMathNode.RETURN_TYPES == ("IMAGE",)
+    assert ImageMathNode.FUNCTION == "imgMathNode"
+    assert ImageMathNode.CATEGORY == "More math"
+
+import tokenize
+from io import StringIO
+
+def tokenize_expression(expr):
+    # Always add a trailing newline to avoid TokenError on incomplete input
+    if not expr.endswith('\n'):
+        expr = expr + '\n'
+    f = StringIO(expr)
+    try:
+        tokens = tokenize.generate_tokens(f.readline)
+        filtered_tokens = []
+        for toktype, tokval, _, _, _ in tokens:
+            token_name = tokenize.tok_name[toktype]
+            if token_name in {'COMMENT', 'NL', 'NEWLINE', 'INDENT', 'DEDENT'}:
+                continue
+            filtered_tokens.append((token_name, tokval.strip()))
+        return filtered_tokens
+    except tokenize.TokenError as e:
+        # Return a special token to indicate tokenization error for incomplete input
+        return [('TOKENIZE_ERROR', str(e))]
+
+@pytest.mark.parametrize(
+    "expr,expected_ast",
+    [
+        ("a+b", ('BINOP', ('+', ('VARIABLE', 'a'), ('VARIABLE', 'b')))),
+        ("-a", ('UNARYOP', ('-', ('VARIABLE', 'a')))),
+        ("abs(a)", ('FUNCTION', ('ABS', [('VARIABLE', 'a')]))),
+        ("a*(b+c)", ('BINOP', ('*', ('VARIABLE', 'a'), ('PARENTHESIS', ('BINOP', ('+', ('VARIABLE', 'b'), ('VARIABLE', 'c'))))))),
+        ("min(a, b, 1)", ('FUNCTION', ('MIN', [('VARIABLE', 'a'), ('VARIABLE', 'b'), ('LITERAL', 1.0)]))),
+        ("pi+e", ('BINOP', ('+', ('LITERAL', 3.141592653589793), ('LITERAL', 2.718281828459045)))),
+        ("a % 2", ('BINOP', ('%', ('VARIABLE', 'a'), ('LITERAL', 2.0)))),
+    ]
+)
+def test_parser_valid_expressions(expr, expected_ast):
+    tokens = tokenize_expression(expr)
+    # Skip test if tokenization failed (should not happen for valid expr)
+    if tokens and tokens[0][0] == 'TOKENIZE_ERROR':
+        pytest.skip(f"Tokenization failed: {tokens[0][1]}")
+    parser = Parser(tokens)
+    ast = parser.parse_expression()
+    assert ast == expected_ast
+
+@pytest.mark.parametrize(
+    "expr,err_msg",
+    [
+        ("a + )", "Unexpected right parenthesis"),
+        ("(a + b", "Missing closing parenthesis"),
+        ("a + * b", "Unexpected token '*'"),
+        ("min(a, b", "Missing closing parenthesis for function"),
+        ("a +", "Unexpected end of input"),
+    ]
+)
+def test_parser_errors(expr, err_msg):
+    tokens = tokenize_expression(expr)
+    if tokens and tokens[0][0] == 'TOKENIZE_ERROR':
+        # Accept Python's tokenize error for incomplete input
+        assert (
+            'unexpected EOF in multi-line statement' in tokens[0][1]
+            or 'Missing closing parenthesis' in err_msg
+            or 'Missing closing parenthesis for function' in err_msg
+        )
+        return
+    parser = Parser(tokens)
+    with pytest.raises(SyntaxError) as excinfo:
+        parser.parse_expression()
+    assert err_msg in str(excinfo.value)